Regulating the damper of steam-boilers by the pressure of the steam



P". CLARK. STATIC REGULATOR 20R STEAM BOILER rmns. No. 10,387. I ,Pategted' Jan. 3. 1854.

PATRICK CLARK, RAHWVASQNEVV JERSEY.

REGULATING THE DAMPER OF STEAM-BOILERS BY THE PRESSUREOF STEAM.

Specification of Letters Patent No. 10,387, dated January 3, 1854.

To all whom it may concern:

Be it known that I, PATRICK CLARK, of Rahway, in the county of Essex and State'of New Jersey, have invented a new and useful Machine for Controlling and Regulating the Combustion of Fuel Under Steam- Boilers.

The nature of my invention consists in causing the damper in the chimney (or if a blower is used, the damper for shutting off the blast) to be acted on by the pressure of the steam, so that when the head of steam in the boiler has attained the pressure required the damper will be closed, but when the pressure is less than that, say by 1 pound per square inch, the damper will be opened. And I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making a part of this specification in which- Figure 1 is a perspective view of the machine as connected with the boiler by means of the pipe C and with the damper in the chimney by means of the lever H and rod K. Figs. 2 and 3 are vertical sect-ions through the center in which Fig. 2, shows the piston up and Fig. 3- shows the piston down.

The same letters represent the same parts in all the figures.

A is a base or platform of cast iron onrubber, or any flexible substance having considerable strength and being impervious to water. It is-sho-wn in Figs. 2 and 3, intervening between the piston F and the water D. It is made cylindrical in form of a length suflicient to allow of the piston moving through any distance required, about one inch is sufficient, but it may be one or ten feet should the nature of the case require it. One end (the upper end) is closed-2'. 6., it has a bottom in it. The lower j end is open and is surrounded by a fianch about one inch wide, which answers the double purpose of holding it (the diaphragm) to its place, and making a tightoint between the fianch of the cylinder and the top of the platform upon which the cylinder rests.

Take notice: A flat disk of vulcanized rubber will answer in place of the above. de-

scribed diaphragm where the distance sufficient to allow of the free motion of the 7 piston which is simply a plain cylindrical piece of cast iron fitting the upper part of the cylinder loosely and having a hole bored nearly through its axis from the top to receive the bar G, the bar is smaller than the hole in which it stands to allow of its accommodating itself to the varying position of the lever H which rests on its top.

(I) is a ball or weight made to slide back and forward on the lever. It is used to counterbalance the static pressure on the bottom of the piston.

K is a rod connecting the lever H with the crank of the damper L'Fig. 1.

The machine as described by the foregoing, being put in connection wit-h the boiler and damper as shown in Fig. 1 the ball on the lever H is a little more than counterbalanced the lever will be lifted, thereby closing the damper, of course if thepressure now diminishes a little, the weight and lever will descend and open the damper, to be closed again if the pressure of the steam should rise above the given point.

I do not claim operating the damper of a steam boiler fire by-means of the pressure of the steam in a boiler nor do I claim to have invented the diaphragm, nor its use to avoid friction where fluid pressure is used to produce motion.

lVhat I do claim iS-# The combination of a cylindrical diaphragm with a cylinder and piston as de-' scribed in the foregoing specification and presence of the Witnes ses Whos e names are illustrated bythe accompanying drawings in hereunto subscribed on the 15th day of July Figs. 2 and 3 for the purpose of operating 1853.

the damper of a boiler fire by means of the PATRICIC CLARK. 5 pressure of the steam. Signed in our presence: i

In testimony whereof I the said PATRICK JOSEPH WVOODRUFF,

CLARK hereunto subscribe my-neme in the CHERLEs TIGI-IE. 

